Suppose 3 L of a gas at 760 torr (760 mm Hg) is contained in…

Suppose 3 L of a gas at 760 torr (760 mm Hg) is contained in a cylinder equipped with a piston as shown on the left below.  What will happen to the pressure of the gas within the cylinder if the piston is pushed down to decrease the volume to 1 L while the temperature held constant as depicted in the diagram to the right above?